Doppler-shifted neutral beam line shape and beam transmission Metadata

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  • Main Title Doppler-shifted neutral beam line shape and beam transmission


  • Author: Kamperschroer, J. H.
    Creator Type: Personal
  • Author: Grisham, L. R.
    Creator Type: Personal
  • Author: Kokatnur, N.
    Creator Type: Personal
  • Author: Lagin, L. J.
    Creator Type: Personal
  • Author: Newman, R. A.
    Creator Type: Personal
  • Author: O`Connor, T. E.
    Creator Type: Personal
  • Author: Stevenson, T. N.
    Creator Type: Personal
  • Author: von Halle, A.
    Creator Type: Personal


  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: USDOE, Washington, DC (United States)


  • Name: Princeton University. Plasma Physics Laboratory.
    Place of Publication: New Jersey
    Additional Info: Princeton Univ., NJ (United States). Plasma Physics Lab.


  • Creation: 1994-04-01


  • English


  • Content Description: Analysis of Doppler-shifted Balmer-{alpha} line emission from the TFTR neutral beam injection systems has revealed that the line shape is well approximated by the sum of two Gaussians, or, alternatively, by a Lorentzian. For the sum of two Gaussians, the broad portion of the distribution contains 40% of the beam power and has a divergence five times that of the narrow part. Assuming a narrow 1/e- divergence of 1.3{degrees} (based on fits to the beam shape on the calorimeter), the broad part has a divergence of 6.9{degrees}. The entire line shape is also well approximated by a Lorentzian with a half-maximum divergence of 0.9{degrees}. Up to now, fusion neutral beam modelers have assumed a single Gaussian velocity distribution, at the extraction plane, in each direction perpendicular to beam propagation. This predicts a beam transmission efficiency from the ion source to the calorimeter of 97%. Waterflow calorimetry data, however, yield a transmission efficiency of {approximately}75%, a value in rough agreement with predictions of the Gaussian or Lorentzian models presented here. The broad wing of the two Gaussian distribution also accurately predicts the loss in the neutralizer. An average angle of incidence for beam loss at the exit of the neutralizer is 2.2{degrees}, rather than the 4.95{degrees} subtended by the center of the ion source. This average angle of incidence, which is used in computing power densities on collimators, is shown to be a function of beam divergence.
  • Physical Description: 35 p.


  • Keyword: Fuels
  • Keyword: Scattering 700460
  • Keyword: Beam Injection Heating
  • STI Subject Categories: 70 Plasma Physics And Fusion Technology
  • Keyword: Tftr Tokamak
  • Keyword: Neutral Beam Sources
  • Keyword: Heating And Fueling Systems


  • Other Information: PBD: Apr 1994


  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI


  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report


  • Text


  • Other: DE94009830
  • Report No.: PPPL--2981
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/10141664
  • Office of Scientific & Technical Information Report Number: 10141664
  • Archival Resource Key: ark:/67531/metadc1316301


  • Display Note: INIS; OSTI as DE94009830; Paper copy available at OSTI: phone, 865-576-8401, or email,